/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * 
 * @format
 */

'use strict';

const os = require('os');

module.exports = workers => {
  const cores = os.cpus().length;
  return typeof workers === 'number' && Number.isInteger(workers) ?
  Math.min(cores, workers > 0 ? workers : 1) :
  Math.max(1, Math.ceil(cores * (0.5 + 0.5 * Math.exp(-cores * 0.07)) - 1));
};